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1 2011 Long Lake, Plainfie ld Township, MI Milfoil Solution Progress Report Prepared for: Plainfield Township Prepared by: EnviroScience, Inc., 3781 Darrow Road, Stow, Ohio (800) oscienceinc.com September 23, 2011

2 I. Introduction Eurasian watermilfoil (Myriophyllum spicatum, hereafter referred to as milfoil) is an exotic aquatic species that tolerates a wide range of growing conditions and outcompetes native vegetation. Monoculture es of milfoill limit recreational use, reduce biodiversity, and can cause detrimental changes to water temperature and dissolvedd oxygen in severe infestations. The native North American beetle, the milfoil weevill (Euhrychiopsis lecontei), has been augmented in Long Lake, Iosco County, Michigan, since 2009 to suppress the growth of milfoil. This weevil is a specialist herbivore of milfoill and damages the plant in multiple ways. The most significant impact is caused by the weevil larva as it damages the meristem, or growing tip, and burrows through the stem. Nutrient flow in the plant is disrupted and the stem loses buoyancy and collapses in the water column. A cascading effect pulls neighboring plants lower into the water column and the rate of photosynthesis is significantly reduced in these stems. The following is an outline of the Milfoil Solution project at Long Lake: Year Survey Dates Sites Established Weevils Stocked 2009 Initial: 6/11, 6/18 Followup: 8/10 M1, S1, S2, 22, Initial: 6/10, 6/17 Followup: 8/27 Initial: 6/22, 6/30 Followup: 8/25 S3, S4, S5 S6 95,000 (5 sites) 92,000 (6 sites) 2012 See Section V Final Survey II. Survey Methods An initial survey is performed prior to weevil stocking and a followup survey is conducted six to eight weeks later. Qualitative observations include overall milfoil density and health, native plant species present, and the presence of weevils and weevilinduced damage. Quantitative measurements include milfoil density and weevil population density. Milfoil density is determined by randomly collecting stems throughout the milfoil bed using a quadrat. This sample is then converted to the number of stemss per square meter (stems/m 2 ). Weevil population density (number of weevils per stem) is determined through lab analysis of 30 stems sampled from three transect lines at each site / TOLL FREE: / FAX:

3 III. Survey Results and Weevil Stocking Seven sites were surveyed in 2011 (S1S6, M1) andd six sites were stocked this year (S1S6) with a total of 92,000 weevils. Weevil densities (Table 1.) and milfoil densities (Table 2.) were recorded for each stocking and monitoring site. S1 23,000 weevils were stocked at this site. Laboratory analysis of milfoil samples from S1 revealed fifteen weevil life stages and weevilinduced damage to 33% of the stems. S2 and S3 20,000 weevils were stocked between these two connecting sites. Thirteen weevil life stages were found in S2 and damage was observed on 67% of these samples. S3 revealed four weevil lifee stages and damage to 22% of the samples. S4 12,000 weevils were stocked in S4. Laboratory analysis revealed four weevil life stages and damage to 33% of the samples. S5 32,000 weevils were stocked and thirteen weevil life stages were found on samples with 45% weevilinducedd stem damage. S6 5,000 weevils were stocked at this newlyestablished site. Laboratory analysis revealed damage to 52% of samples and twentytwo weevil life stages were found throughout the initial and followup surveys.. M1 Analysiss of milfoil from the monitoring site revealed ten weevil life stagess and damage to 56% of the samples. Twelve native aquatic plant species weree recorded in 2012: Clasping leaf pondweedd (Potamogeton perfoliatus), Chara (Charaa sp.), Coontail (Ceratophyllum demersum),, Eelgrass/Water Celery (Valisneria americana), Elodea (Elodeaa canadensis), Flatstem pondweed (P. zosteriformis), Large leaf pondweed (P. amplifolius), Northern watermilfoil (Myriophyllum sibiricum), Sago pondweed (P. pectinatus), Thin pondweed (P. pusilus), White waterbutterc cup (Ranunculus aquatilus), and White water lily (Nymphaea spp.) / TOLL FREE: / FAX:

4 IV. Discussion The desired impacts of stocking the weevil include reductions in the overall extent and density of the milfoil and stems growing further below the surface of the water at non nuisance levels. Survey results from 2009 to 2011show that Long Lake provides the necessary habitat for a milfoil weevil population to thrive and return after overwintering. The following points of discussion refer to survey activities and results from 2011: Weevil life stages and weevilindu uced damage were observed in the field and during laboratory analysis at all sites during the initial and followup surveys in The weevil population at the monitoring site (M1) has increased from 2009 in which it was previously undetectable (Table 1.). Since that time, milfoil density has decreased by 54% (Table 2.).. The natural weevil population at this site has not been directly augmented and it is likely that weevils are migrating to M1 from nearby sites. Of the stocking sites, S6 displayedd the most improvement this year. At the time of the followup survey, milfoil was falling over and contained highly visible weevil equire a season to rebound. These sites will continue to be stocked as outlined in Section V. An increase in native aquatic plant species and abundance has been observed in induced stem damage. Milfoil density at S1 decreased by 27% from 2010 to S2 and S4 have experienced increases and the observed weevil populations at these sites may the lake since Previous surveys revealed seven to ten individual plant species, whereas twelve individual species were recorded in Native species are an important component because they outcompets reported that the milfoil is milfoil and help to maintain it to low levels. Field observations beginning to break up along the outer edges of the toppedout milfoil at S1S5. V. Future Recommen ndations Long Lake exhibits high water clarity likely due to the zebra mussel populations found at each survey site. These invasive mussels provide excellent growing conditions for the aquatic plant species and milfoil has been found growing at depths from 10 to 20. Additionally, 2011 has been an excellent year for milfoil growth statewidee and the progresss of the weevil project in Long Lake has been slower than originally expected / TOLL FREE: / FAX:

5 EnviroScience remains confident that weevils are able to provide longterm control in Long Lake and recommends a continued aggressive management approach. All sites (excluding S6) will be stocked in 2012 and areas of infestationn on the western side of the lake will need to be addressed in the future. It iss the recommendationn of EnviroScience to stock 60k weevils in 2012 (rather than 40k) and has offered to match half of the contracted weevils. If you have questions or comments regarding this report, please contact Sarah Lomske at (800) , or at Sincerely, Sarah Lomske Field Biologist / TOLL FREE: / FAX:

6

7 Table 1. Average Weevil Density (weevils/stem) 2009 Site S S S3 S4 S5 S6 M Table 2. Average Milfoil Density (stems/m 2 ) Site 2009 S S S3 ** S4 ** S5 ** S6 ** M **Site not established ** / TOLL FREE: / FAX:

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